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A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62423

Jordan,  Armin
Service Facility Gas Analytical Laboratory, Dr. A. Jordan, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Yver, C. E., Pison, I. C., Fortems-Cheiney, A., Schmidt, M., Chevallier, F., Ramonet, M., et al. (2011). A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion. Atmospheric Chemistry and Physics, 11(7), 3375-3392. doi:10.5194/acp-11-3375-2011.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-DCF7-3
Abstract
This paper presents an analysis of the recent tropospheric molecular hydrogen (H-2) budget with a particular focus on soil uptake and European surface emissions. A variational inversion scheme is combined with observations from the RAMCES and EUROHYDROS atmospheric networks, which include continuous measurements performed between mid-2006 and mid-2009. Net H-2 surface flux, then deposition velocity and surface emissions and finally, deposition velocity. biomass burning, anthropogenic and H-2 fixationrelated emissions were simultaneously inverted in several scenarios. These scenarios have focused on the sensibility of the soil uptake value to different spatio-temporal distributions. The range of variations of these diverse inversion sets generate an estimate of the uncertainty for each term of the H-2) budget. The net H-2 flux per region (High Northern Hemisphere, Tropics and High Southern Hemisphere) varies between -8 and +8 Tg yr(-1). The best inversion in terms of tit to the observations combines updated prior surface emissions and a soil deposition velocity map that is based on bottom-up and top-down estimations. Our estimate of global H-2 soil uptake is -59+/-9 Tg yr(-1). Forty per cent of this uptake is located in the High Northern Hemisphere and 55% is located in the Tropics. In terms of surface emissions, seasonality is mainly driven by biomass burning emissions. The inferred European anthropogenic emissions are consistent with independent H2 emissions estimated using a H-2/CO mass ratio of 0.034 and CO emissions within the range of their respective uncertainties. Additional constraints, such as isotopic measurements would be needed to infer a more robust partition of H-2 sources and sinks.